It's just one sentence, and it's pretty complicated, but notice that in the upper left corner, you can see the vertical line dividing the subject and the predicate.

We the people of the United States, in order to form a more perfect Union, establish justice, insure domestic tranquility, provide for the common defense, promote the general welfare, and secure the blessings of liberty to ourselves and our posterity, do ordain and establish this Constitution of the United States of America.

The complete subject contains all of the words that tell us whom or what a sentence is about.

The complete predicate contains the verb and all of the words that modify or complete it.

Don't worry too much about those things now. Just focus on the fact that even really complicated sentences are divided between the subject and the predicate.

Sentence Construction & Sentence Fragments

Some groups of words don't have what it takes to be a complete sentence.

If a group of words is missing one of those two key elements we talked about (subject + predicate), it is a sentence fragment. A sentence fragment is a group of words that does not express a complete thought.

When you read a sentence fragment, you are left wondering whom or what the sentence is about or what happened in the sentence.

You can change a sentence fragment into a complete sentence by adding the missing information.